The big commercial machines (my good friend's son manages a big plant up in Fox Creek BC) have it down to a real science. The wood shavings (sawdust is a poor substitute) must be exactly the right moisture content, they must go through the dies at the right speed or they will either not adhere well, or they will heat up the dies and scorch etc. etc.
My 2 tons this year are quite scorched so they were obviously going through too slowly.
They guy who had a small machine complained that most of his time was spent
1. setting up,
2. getting everything running right,
3. shutting down to unclog the hopper
4. if die is free goto 6
5. shutting down to unclog the die
6. goto #1
It isn't as simple a procedure as it looks, but, that being said, if you have the time, and you are running a Lister on free WVO and are just doing it for your own fuel, then it might pay.
Stan